کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1484772 1510526 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrolysis–condensation reactions of diethylphosphato-ethyltriethoxysilane with tetraethoxysilane studied by 29Si-NMR: Solvent and phosphonate catalytic effect
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Hydrolysis–condensation reactions of diethylphosphato-ethyltriethoxysilane with tetraethoxysilane studied by 29Si-NMR: Solvent and phosphonate catalytic effect
چکیده انگلیسی

Hydrolysis and condensation reactions of diethylphosphato-ethyltriethoxysilane (SiP) and a mixture of SiP and tetraethoxysilane (TEOS) have been studied in ethanol and N-methylacetamide (NMA) as solvent. Conditions of reaction used for both SiP and SiP/TEOS mixture were Si/solvent (ethanol or NMA)/water molar ratio equals to 1/20/5 at 30 °C and without addition of external catalyst. The reactions have been investigated by high resolution 29Si nuclear magnetic resonance (NMR). The hydrolyzed and condensed species, from SiP and TEOS were identified and quantified for both solvents as a function of reaction time. The influences of the amide medium as well as the catalytic effect of the phosphonate function of SiP on TEOS hydrolysis were established.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 354, Issues 15–16, 15 March 2008, Pages 1654–1663
نویسندگان
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